Question 1134753


Carlos is {{{3}}} years older than Juan.
 
{{{Carlos=Juan+3}}}.....eq.1

Jose is {{{4}}} years younger than Juan.

{{{Jose=Juan-4}}}.........eq.2


 The sum of their {{{3 }}}ages is {{{140}}}. 

{{{Juan+Carlos+Jose=140}}}.........substitute {{{Carlos}}} and {{{Jose}}} from eq.1 and eq.2

{{{Juan+Juan+3+Juan-4=140}}}

{{{3Juan-1=140}}}

{{{3Juan=140+1}}}

{{{Juan=141/3}}}

{{{highlight(Juan=47)}}}-> your answer is: Juan is {{{47}}} years old


{{{Carlos=Juan+3=47+3=50}}}
{{{Jose=Juan-4=47-4=43}}}

check the sum:
{{{Juan+Carlos+Jose=140}}}
{{{47+50+43=140}}}
{{{140=140}}}